Pyridine and triphenylphosphine oxide activation of sulfonyl chlorides in the syntheses of (E) alk-1-enyl sulfones
摘要:
This paper describes efficient and new approaches to (E) alk-1-enyl sulfones, starting from sulfonyl chloride/pyridine or sulfonyl chloride/triphenylphosphine complexes in the presence of (E) di-iso-butyl alk-1-enyl alanes.The use of CuCl in the presence of sulfonyl chloride/pyridine complexes or pyridine in the presence of sulfonyl chloride/triphenylphosphine complexes, respectively, results in a remarkable increase in the yields and conversions. (C) 2008 Elsevier Ltd. All rights reserved.
anti-selective hydrosulfonylation of unactivatedalkynes with sulfonyl chlorides in the presence of a catalytic amount of phenanthroline-based Lewis base and (Me3Si)3SiH as the hydrogen atom donor has been developed. The protocol proceeds efficiently under mild and metal-free conditions, delivering a diverse set of (Z)-vinyl sulfones with high stereoselectivity. Additionally, the method displays excellent
Pyridine and triphenylphosphine oxide activation of sulfonyl chlorides in the syntheses of (E) alk-1-enyl sulfones
作者:G. Signore、C. Malanga、R. Menicagli
DOI:10.1016/j.tet.2008.09.056
日期:2008.12
This paper describes efficient and new approaches to (E) alk-1-enyl sulfones, starting from sulfonyl chloride/pyridine or sulfonyl chloride/triphenylphosphine complexes in the presence of (E) di-iso-butyl alk-1-enyl alanes.The use of CuCl in the presence of sulfonyl chloride/pyridine complexes or pyridine in the presence of sulfonyl chloride/triphenylphosphine complexes, respectively, results in a remarkable increase in the yields and conversions. (C) 2008 Elsevier Ltd. All rights reserved.