Iterative stereospecific reagent-controlled homologation of pinacol boronates by enantioenriched alpha-chloroalkyllithium reagents.

Iterative stereospecific reagent-controlled homologation of pinacol boronates by enantioenriched alpha-chloroalkyllithium reagents.
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通过对映体富集的α-氯烷基锂试剂对频哪醇硼酸酯进行迭代立体特异性试剂控制同系化。

DOI:
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发表时间:
2007
影响因子:
15
通讯作者:
M. Burge
M. Burge
中科院分区:
化学1区
文献类型:
--
作者:
P. Blakemore;M. Burge

文献摘要

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在−78 °C的PhMe溶液中,通过与叔丁基锂进行亚砜配体交换,由纯手性α-氯烷基亚砜原位生成了对映体富集的α-氯烷基锂,硼酸频哪醇酯与该物质反应,得到了具有良好立体化学保真度的扩链硼酸酯产物。这种立体特异性试剂控制的同系化(StReCH)过程的迭代使得能够在所有情况下程序化合成含立体二联体的模型系统(4-苄基-1,6-二苯基己-2-醇)的所有四种立体异构体,其中er ≥ 97:3。
Reaction of pinacol boronates with putative enantioenriched α-chloroalkyllithium species, generated in situ from homochiral α-chloroalkylsulfoxides by sulfoxide ligand exchange with t-BuLi in PhMe at −78 °C, gave chain-extended boronic ester products with generally excellent stereochemical fidelity. Iteration of this stereospecific reagent-controlled homologation (StReCH) process enabled the programmed synthesis of all four stereoisomers of a stereodiad-containing model system (4-benzyl-1,6-diphenylhexan-2-ol) with er ≥ 97:3 in all cases.