1988
DOI: 10.1002/cber.19881210705
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Chirale Lactole, VII. O,O‐ und O,N‐Acetalbildungsreaktionen der enantiomerenreinen exo‐anellierten Octahydro‐7,8,8‐trimethyl‐4,7‐methanobenzofuran‐2‐ol‐Schutzgruppe

Abstract: Das enantiomerenreine Lactol 3a reagiert mit Hydroxylverbindungen anomer selektiv und zeigt bei der Acetalbildung mit racemischen Verbindungen vom Typ 2 Enantiomer-Selektivitat. Konforrnationsanalytische uberlegungen in Hinblick auf eine Absolutkonfigurationsbestimmung von Verbindungen des Typs 2 werden angestellt. Bei der Reaktion mit Aminen bildet 3a mit sekundaren Aminen einheitliche 0,N-Acetale, wiihrend bei der Umsetzung mit primhen Aminen Anomerengemische erhalten werden. Die durch R6ntgenstrukturanalyse… Show more

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Cited by 39 publications
(6 citation statements)
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“…For the acetals 3-6, however, a correlation with the results obtained for analogous compounds by Noe et al11,12,36,17) can be established. According to these investigations, the phenol I1 consists of an asymmetric carbon atom bearing a hydroxy group, a hydrogen atom, a bulky methyl group, and the planar phenol substituent.…”
Section: Discussion Of the Configuration And Conformationmentioning
confidence: 55%
“…For the acetals 3-6, however, a correlation with the results obtained for analogous compounds by Noe et al11,12,36,17) can be established. According to these investigations, the phenol I1 consists of an asymmetric carbon atom bearing a hydroxy group, a hydrogen atom, a bulky methyl group, and the planar phenol substituent.…”
Section: Discussion Of the Configuration And Conformationmentioning
confidence: 55%
“…For this purpose we designed a clearly non-prebiotic, artificial carbohydrate-terpene chimera. This was achieved by annulating a five or six membered lactol ring to a bornane system in a manner that would allow access of reaction partners only from one side of the ring [ 26 , 27 , 28 , 29 , 30 ], leading to stereoselectivity.…”
Section: Discussionmentioning
confidence: 99%
“…According to the procedure described in [21], a soln. of 7 (7.4 g, 60.2 mmol) and (MBE) 2 O (11.8 g, 32 mmol) in CH 2 Cl 2 (70 ml) was treated with 1 g of Na 2 SO 4 and ca.…”
Section: Experimental Partmentioning
confidence: 99%
“…The (R)-1-phenylethanol was enantiomerically enriched by mixed acetal formation with the terpene carbohydrate mimic (MBE) 2 [21] to 8, followed by crystallization of 8 from MeOH for two times and then methanolysis [14]. By this protocol, we obtained the required (R)-1-phenylethanol (7) in an overall yield of 67% and an enantiomeric purity of 99.8% ee.…”
mentioning
confidence: 99%