3-Substituted-γ-butyrolactones from 5-Trimethylsilyl-2-cyclohexenone. Synthesis of (−)-Enterolactone
摘要:
1,4-Adducts of 5-trimethylsilyl-2-cyclohexenone (1) with Grignard reagents were converted to various hexanoate derivatives and γ-butyrolactones.从光学纯的 1 开始,合成了 (-)- 肠内酯(因子 X)。
Asymmetric Synthesis of 5-Arylcyclohexenones by Rhodium(I)-Catalyzed Conjugate Arylation of Racemic 5-(Trimethylsilyl)cyclohexenone with Arylboronic Acids
[reaction: see text] A catalytic asymmetric conjugate arylation of racemic 5-(trimethylsilyl)cyclohex-2-enone with arylboronic acids was catalyzed by 3 mol % chiral amidophosphane- or BINAP-Rh(I) in dioxane-water (10:1) to afford trans- and cis-3-aryl-5-(trimethylsilyl)cyclohexanones in high enantioselectivity. Dehydrosilylation of the product mixture with cupric chloride in DMF gave 5-arylcyclohex-2-enones