2007
DOI: 10.1021/jo0626111
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Synthesis of Some Members of the Hydroxylated Phenanthridone Subclass of the Amaryllidaceae Alkaloid Family

Abstract: The total synthesis of several members of the hydroxylated phenanthridone sub-class of the Amaryllidaceae alkaloid family has been carried out. (±)-Lycoricidine and (±)-7-deoxypancratistatin were assembled through a one-pot Stille/intramolecular Diels-Alder cycloaddition cascade to construct the core skeleton. The initially formed [4+2]-cycloadduct undergoes nitrogen-assisted ring opening followed by a deprotonation/reprotonation of the resulting zwitterion to give a rearranged hexahydroindolinone on further h… Show more

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Cited by 95 publications
(49 citation statements)
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“…This synthesis was designed to produce the C-1 aldehyde that could eventually serve as as ource of unnatural derivatives (see Section 3.16). Thea mide nitrogen was then reprotected as its corresponding PMB ether,a nd the TBDMS ether was cleaved with TBAF.I nt he following step,C hugaev elimination [62] of an alcohol at C-2 provided olefin 63 in 22 %yield over three steps.C ompound 63 is ak nown intermediate in Padwas synthesis of 7-deoxypancratistatin [50] and its attainment formalized the synthesis of 7-deoxypancratistatin (Padwa prepared 2 in 7steps from 63). [60] Theo riginal aim of this particular strategy was the synthesis of aldehyde 61 and its conversion to 7-deoxypancratistatin (2)was of secondary importance.Itdid not proceed without problems,a se videnced by the number of quite arduous transformations required to convert 61 to 7-deoxypancratistatin (2)( Scheme 13).…”
Section: Hudlicky (2010) -( + +)-7-deoxypancratistatin (2)mentioning
confidence: 99%
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“…This synthesis was designed to produce the C-1 aldehyde that could eventually serve as as ource of unnatural derivatives (see Section 3.16). Thea mide nitrogen was then reprotected as its corresponding PMB ether,a nd the TBDMS ether was cleaved with TBAF.I nt he following step,C hugaev elimination [62] of an alcohol at C-2 provided olefin 63 in 22 %yield over three steps.C ompound 63 is ak nown intermediate in Padwas synthesis of 7-deoxypancratistatin [50] and its attainment formalized the synthesis of 7-deoxypancratistatin (Padwa prepared 2 in 7steps from 63). [60] Theo riginal aim of this particular strategy was the synthesis of aldehyde 61 and its conversion to 7-deoxypancratistatin (2)was of secondary importance.Itdid not proceed without problems,a se videnced by the number of quite arduous transformations required to convert 61 to 7-deoxypancratistatin (2)( Scheme 13).…”
Section: Hudlicky (2010) -( + +)-7-deoxypancratistatin (2)mentioning
confidence: 99%
“…[41] Compound 294 was found to be inactive while tosylamide 292 exhibited > 10 mgmL À1 as GI 50 [41] Compound 294 was found to be inactive while tosylamide 292 exhibited > 10 mgmL À1 as GI 50 …”
Section: Reviewsmentioning
confidence: 99%
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“…1,2,3 However, little attention has been given to approaches to these systems which utilise metal-catalysed aryl-allene couplings, despite the obvious 20 potential of this route to produce such systems with high degrees of chemo-and regioselectivity. Nonetheless, the potential of this approach has been underlined previously.…”
mentioning
confidence: 99%
“…Thus, treatment of isomer 26 (in which the OH group resides anti to H-10) with POCl 3 (py, 60 8C) led directly to 28 (81 % yield), whereas isomer 27 (in which the OH group is syn to H-10) required conversion into its xanthate first (NaH, CS 2 , MeI, 0!25 8C), and then syn elimination, a process that proceeded smoothly upon microwave irradiation at 185 8C (92 % overall yield). [12] The next hurdle to be overcome was the regio-and stereoselective hydration of the C-10-C-28 olefinic bond in the presence of the other two within intermediate 28. An expedient tactic to solve this seemingly thorny problem was devised based on the unique steric environment of each olefinic bond within this substrate.…”
mentioning
confidence: 99%