Iron-Promoted Elimination of β-Thioalkoxy Alcohols. Olefination by Coupling of a Carbonyl Group with a Dithioacetal
摘要:
Treatment of propargylic dithiolanes with (BuLi)-Bu-n followed by a carbonyl electrophile yields the corresponding propargylic dithioacetals. Upon treatment with 1 equiv of Fe(acac)(3) and excess MeMgI, elimination of SR and OH moieties from 8 affords the corresponding olefins in satisfactory yield. Benzylic dithioacetals behave similarly. The reaction can be considered an alternative of McMurry coupling of two different carbonyl equivalents.
alkynyl ketones with 1,2-ethanedithiol in the presence of BF 3 -OEt 2 in methanol afforded the corresponding dithioacetal. Removal of the silyl group under basic conditions followed by palladium-catalyzed coupling reactions with aryl iodides yielded the corresponding propargylic dithioacetals in excellent yield.
Iron-Promoted Elimination of β-Thioalkoxy Alcohols. Olefination by Coupling of a Carbonyl Group with a Dithioacetal
作者:Li-Fu Huang、Chih-Wei Chen、Tien-Yau Luh
DOI:10.1021/ol701579f
日期:2007.8.1
Treatment of propargylic dithiolanes with (BuLi)-Bu-n followed by a carbonyl electrophile yields the corresponding propargylic dithioacetals. Upon treatment with 1 equiv of Fe(acac)(3) and excess MeMgI, elimination of SR and OH moieties from 8 affords the corresponding olefins in satisfactory yield. Benzylic dithioacetals behave similarly. The reaction can be considered an alternative of McMurry coupling of two different carbonyl equivalents.