Improved Method for the Synthesis of β-Carbonyl Silyl-1,3-Dithianes by the Double Conjugate Addition of 1,3-Dithiol to Propargylic Carbonyl Compounds
摘要:
Base-mediated double Conjugate addition of 1,3-propane dithiol to various silylated propargylic aldehydes and ketones allows for an efficient and scalable synthesis of beta-carbonyl silyl-1,3-dithianes.
Improved Method for the Synthesis of β-Carbonyl Silyl-1,3-Dithianes by the Double Conjugate Addition of 1,3-Dithiol to Propargylic Carbonyl Compounds
作者:Sumit Mukherjee、Dimitra Kontokosta、Aditi Patil、Sivakumar Rallapalli、Daesung Lee
DOI:10.1021/jo901950e
日期:2009.12.4
Base-mediated double Conjugate addition of 1,3-propane dithiol to various silylated propargylic aldehydes and ketones allows for an efficient and scalable synthesis of beta-carbonyl silyl-1,3-dithianes.
Zinc Radical Transfer Based Modular Approach to Enantiopure Alkylidene-β-prolines from<i>N</i>-(<i>tert</i>-Butylsulfinyl)-α-(aminomethyl)acrylates
N-(tert-Butylsulfinyl)-α-(aminomethyl)acrylates with tethered silylated alkynes undergo a tandem 1,4-addition/carbozincation reaction upon exposure to dialkylzinc compounds in the presence of air. The process follows a zinc-radical-transfer mechanism and provides vinylzinc adducts that can react subsequently with electrophiles. High levels of chiral induction (dr > 90:10) from the tert-butylsulfinyl