Studies into Asymmetric Catalysis of the Nozaki-Hiyama Allenylation
作者:Masahiro Inoue、Masahisa Nakada
DOI:10.1002/anie.200502871
日期:2006.1
B-(.gamma.-(Trimethylsilyl)propargyl)diisopinocampheylborane: A New, Highly Efficient Reagent for the Enantioselective Propargylboration of Aldehydes. Synthesis of Trimethylsilyl-Substituted and Parent .alpha.-Allenic Alcohols in High Optical Purity
作者:Herbert C. Brown、Uday R. Khire、Gowriswari Narla
DOI:10.1021/jo00130a007
日期:1995.12
Nonracemic α-Allenyl Carbinols from Asymmetric Propargylation with the 10-Trimethylsilyl-9-borabicyclo[3.3.2]decanes
作者:Eliud Hernandez、John A. Soderquist
DOI:10.1021/ol051886k
日期:2005.11.1
[reaction: see text] The asymmetric propargylboration of aldehydes at -78 degrees C in <3 h with 1 provides silylated alpha-allenyl carbinols 6 (60-87%) in high ee (94% to >98% ee). The reagents 1 are easily prepared in both enantiomeric forms with a simple Grignard procedure and air-stable borinate complexes 2. The ozonolysis of 6 proceeds smoothly through an acylsilane intermediate to give a TMS
Copper‐Catalyzed Direct and Stereoselective Synthesis of Conjugated Enynes from α‐Allenols
作者:Masahiro Sai、Seijiro Matsubara
DOI:10.1002/adsc.201801211
日期:2019.1.11
A novel strategy for the stereoselective synthesis of conjugated enynes directly from α‐allenols has been developed. The reaction proceeds with perfect E‐selectivity and exhibits high functional group compatibility. This catalytic system can also be applied to the stereoselective synthesis of conjugated dienynes and enediynes.