Synthesis of (6S,7S,9R,10R)-6,9-epoxynonadec-18-ene-7,10-diol, a marine epoxy lipid isolated from the brown alga, Notheia anomala, by an oxiranyl anion strategy
摘要:
The stereocontrolled synthesis of (6S,7S,9R, 10R)-6,9-epoxynonadec-18-ene-7,10-diol, isolated from the brown alga, Notheia anomala, has been achieved. The key 2,3,5-trisubstituted tetrahydrofuran ring was constructed by alkylation of the sulfonyl-stabilized oxiranly anion followed by 5-endo cyclization. (C) 1999 Elsevier Science Ltd. All rights reserved.
Synthesis of (6S,7S,9R,10R)-6,9-epoxynonadec-18-ene-7,10-diol, a marine epoxy lipid isolated from the brown alga, Notheia anomala, by an oxiranyl anion strategy
摘要:
The stereocontrolled synthesis of (6S,7S,9R, 10R)-6,9-epoxynonadec-18-ene-7,10-diol, isolated from the brown alga, Notheia anomala, has been achieved. The key 2,3,5-trisubstituted tetrahydrofuran ring was constructed by alkylation of the sulfonyl-stabilized oxiranly anion followed by 5-endo cyclization. (C) 1999 Elsevier Science Ltd. All rights reserved.
Oxiranyllithium compounds generated from epoxy sulfones by deprotonation with n-butyllithium in THF at −100°C react with α-alkoxy alkyl triflates to give new substituted epoxides in high yields.
anti-selective hydrosulfonylation of unactivatedalkynes with sulfonyl chlorides in the presence of a catalytic amount of phenanthroline-based Lewis base and (Me3Si)3SiH as the hydrogen atom donor has been developed. The protocol proceeds efficiently under mild and metal-free conditions, delivering a diverse set of (Z)-vinyl sulfones with high stereoselectivity. Additionally, the method displays excellent