demonstrated a very generalmethod for the preparation of essentially any terminal 2,3-allenol from the corresponding alkynols, which may be easily available from propargylic alcohols by alkylation, or from terminal alkynes by deprotonation and 1,2-addition with aldehydes or ketones, and subsequent base-catalyzed triple-bond migration. We have demonstrated a very generalmethod for the preparation of essentially
Palladium-Catalyzed Silylation of 2,3-Allenols with Unactivated Disilanes: Access to 2-Silyl-1,3-butadienes and α-Silyl-β-hydroxy Vinylsilanes
作者:Guang-Li Xu、Zhong-Xia Wang
DOI:10.1021/acs.orglett.1c04141
日期:2022.1.21
Regioselective silylation of 2,3-allenols with disilanes was carried out under catalysis of Pd2dba3/P(o-MeOC6H4)3. In the presence of Cs2CO3, the reaction achieved 2-silyl-1,3-dienes. Reaction of 1-aryl-2,3-allenols gave the products with excellent Z/E selectivity and E-isomers as the major species. Reaction of α-alkylallenols or α-alkyl-α-aryl-allenols resulted in products with moderate Z/E selectivity
在 Pd 2 dba 3 /P( o -MeOC 6 H 4 ) 3的催化下,用乙硅烷对 2,3-丙二烯醇进行区域选择性甲硅烷基化。在Cs 2 CO 3存在下,反应得到2-甲硅烷基-1,3-二烯。1-aryl-2,3-allenols的反应得到具有优异Z / E选择性和E-异构体为主要种类的产物。α-烷基烯丙醇或 α-烷基-α-芳基烯丙醇的反应产生具有中等Z / E选择性和E-异构体也是主要的。在没有碱的情况下,该反应产生α-甲硅烷基-β-羟基乙烯基硅烷,其在用Cs 2 CO 3处理后转化为2-甲硅烷基-1,3-二烯。
Cu-Catalyzed Synthesis of 2-Silyl-1,3-butadienes from Allenols and Applications to One-Pot Synthesis of Tetrasubstituted Arylsilanes
chemo- and stereoselective method for the synthesis of (E)-2-silyl-1,3-butadienes from a broad range of allenols using mild Si–B reagents is reported in this study. Our protocol required a short reaction time at ambient temperature to produce the desired dienes in high yields. Synthetic applications are highlighted by the one-potsynthesis of tetrasubstituted arylsilanes from allenols as well as the
本研究报道了一种铜催化化学和立体选择性方法,使用温和的 Si-B 试剂从多种联烯醇合成 ( E )-2-甲硅烷基-1,3-丁二烯。我们的方案需要在环境温度下进行短反应时间才能以高产率产生所需的二烯。从联烯醇一锅合成四取代芳基硅烷以及 C-Si 键的进一步功能化突出了合成应用。
Copper-Catalyzed Reaction of 2,3-Allenols with Silylzinc Reagents: Access to 2-Silyl-1,3-butadienes