The convergent synthesis of (+)-ambrein 1 was achieved based on a modified Julia coupling reaction between aldehyde 14 corresponding to the left-half A and sulfone 25a or 25b corresponding to the right-half B. Aldehyde 14 was synthesized in 14% overall yield (nine steps) from the enzymatic resolution product, epoxy alcohol (8aS)-2. Sulfone 25a or 25b was synthesized in 11 steps (25a: 41% overall yield, 25b: 56% overall yield) from the enzymatic resolution product, (1S,6S)-2,2-dimethyl-6-hydroxyhexane-l-carboxylate 4. (c) 2006 Elsevier Ltd. All rights reserved.
Preparation of (S)-γ-cyclogeraniol by lipase-catalyzed transesterification and synthesis of (+)-trixagol and (+)-luffarin-P
摘要:
Lipase-catalyzed kinetic resolution of gamma-cyclogeraniol by Candida antarctica lipase B yielded 23% of enantiomerically pure (S)-gamma-cyclogeraniol. (+)-trixagol and (+)-luffarin-P were synthesized from the obtained (S)-gamma-cyclogeraniol, and the absolute configuration of natural (+)-luffarin-P was determined to have an S configuration by our first synthesis of (S)-luffarin-P for the first time. (C) 2015 Elsevier B.V. All rights reserved.