A copper-catalyzed silylation of propargyldichlorides was developed to access chloro-substituted allenylsilanes under mild reaction conditions. Moreover, enantioenriched chloro-substituted allenylsilanes can be synthesized in moderate to high yields and good enantioselectivities with this protocol.
enantioselective synthesis of axially chiral chloroallenes from the propargylic dichlorides is reported, employing a catalytic amount of easily prepared SimplePhos ligand. Exclusive formation of the desired allenes was observed with good enantioselectivities (ee’s 62–96%). Further transformations to trisubstituted allenes or terminal alkynes with a propargylicquaternary carbon center keep a high level
Synthesis of Allenyl-Bdan via Cu(I)-Catalyzed Borylation of Propargyl <i>gem</i>-Dichlorides
作者:Ke-Fan Wu、Dong-Ting Dai、Xin-Yue Sun、Yun-He Xu
DOI:10.1021/acs.orglett.2c00704
日期:2022.4.15
Copper-Catalyzed Propargylic Substitution of Dichloro Substrates: Enantioselective Synthesis of Trisubstituted Allenes and Formation of Propargylic Quaternary Stereogenic Centers
the desired 1,3‐substitution products. The enantioenriched chloroallenes could be further transformed into the corresponding trisubstituted allenes or terminal alkynes bearing all‐carbon quaternary stereogenic centers, through the copper‐catalyzed enantiospecific 1,1/1,3‐substitutions. The two successive copper‐catalyzed reactions could be eventually combined into a one‐pot procedure and different desired