A simple synthesis of (−)-(R)-ipsdienol and (−)-(S)-ipsenol
摘要:
A short and efficient synthesis of the unnatural enantiomer of (+)-(S)-ipsdienol 1 and (-)-(S)-ipsenol 2 is presented via an asymmetric allylboration. The synthesis was achieved by using a one-pot reduction-methylenation of an exo-methylene lactone intermediate. (C) 1999 Elsevier Science Ltd. All rights reserved.
A simple synthesis of (−)-(R)-ipsdienol and (−)-(S)-ipsenol
摘要:
A short and efficient synthesis of the unnatural enantiomer of (+)-(S)-ipsdienol 1 and (-)-(S)-ipsenol 2 is presented via an asymmetric allylboration. The synthesis was achieved by using a one-pot reduction-methylenation of an exo-methylene lactone intermediate. (C) 1999 Elsevier Science Ltd. All rights reserved.
Reaction of chiral2-[(tributylstannyl)methyl]propenamides with aldehydes proceeded with 1,6-asymmetric induction to give, after hydrolysis, α,-methylene-γ-butyrolactones in enantiomeric excesses as high as 80%.
Indium-catalyzed enantioselective allylation of aldehydes with β-carbonyl allylstannanes: An efficient synthetic method for chiral α-methylene-γ-lactones
The catalytic enantioselectiveallylation of aldehydes with β-carbonyl allyltributylstannanes in the presence of chiral indium complexes gave the optically active homoallylic alcohols, which can be converted to the corresponding optically active α-methylene-γ-butyrolactones.