Fast [3+2] Cycloaddition Synthesis of (&amp;#xB1;) Pterocarpans under Microwave Irradiation

Ventura, Claiton Pires; Viana, Iara Maira de O.; Ferreira, Eruzia A.E.; Freitas, Rossimiriam Pereira de; Alves, Rosemeire Brondi

doi:10.2174/157017810791514896

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Cycloaddition Reactions Of 2h-chromenes With Benzoquinones2

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Section: Cycloaddition Reactions Of 2h-chromenes With Benzoquinonesmentioning

confidence: 99%

“…Following this procedure, a total synthesis of natural pterocarpan edulane (101) has been achieved (scheme 35) [96]. Recently, microwave heating has been used to improve yields of this cycloaddition reaction catalyzed with Zn(II) [97]. The development of a general synthetic route to substituted 5 or 11-azapterocarpans (105¸106) and diazapterocarpans (107) via Lewis acid promoted reactions of mono and bisimides (102 and 103) with chromenes (88) and/or 1,2-dihydroquinolines (104), has been also described by Engler's group (scheme 36 and Table 3) [26,[98][99][100][101][102].…”

Section: Cycloaddition Reactions Of 2h-chromenes With Benzoquinonesmentioning

confidence: 99%

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