Spirodiepoxide-Based Cascades: Direct Access to Diverse Motifs
摘要:
Allene epoxide formation/opening reaction sequences enabled direct access to diverse products. Described here are a single flask procedure for allene preparation and allene oxidation/derivatization reactions that give, among others, diendiol, diyndiol, alpha'-hydroxy-gamma-enone, dihydrofuranone, butenolide, and delta-lactone products.
Spirodiepoxide-Based Cascades: Direct Access to Diverse Motifs
摘要:
Allene epoxide formation/opening reaction sequences enabled direct access to diverse products. Described here are a single flask procedure for allene preparation and allene oxidation/derivatization reactions that give, among others, diendiol, diyndiol, alpha'-hydroxy-gamma-enone, dihydrofuranone, butenolide, and delta-lactone products.
Organozinc Reagents in DMSO Solvent: Remarkable Promotion of S<sub>N</sub>2′ Reaction for Allene Synthesis
作者:Koji Kobayashi、Hiroshi Naka、Andrew E. H. Wheatley、Yoshinori Kondo
DOI:10.1021/ol801249w
日期:2008.8.7
The S N2' reaction of propragyl mesylates with organozinc reagents was dramatically improved in DMSOsolvent, and the stereoselective conversion of chiral substrates was successfully achieved using LiCl-free diorganozinc without the loss of optical purity.
Stereospecific anti SE2′ fluorination of allenylsilanes: synthesis of enantioenriched propargylic fluorides
作者:Laurence Carroll、Samantha McCullough、Tom Rees、Timothy D. W. Claridge、Véronique Gouverneur
DOI:10.1039/b803888k
日期:——
The electrophilic fluorodesilylation of enantioenriched allenylsilanes proceeds with efficient transfer of chirality. The silylationâfluorination of propargylic alcohols occurs with overall retention of stereochemistry, a result consistent with a stereospecific anti SE2â² mechanism for the fluorination step.