Acylation Mechanisms of DMSO/[D6]DMSO with Di-tert-butylketene and Its Congeners
作者:Rudolf Knorr
DOI:10.1002/ejoc.201100936
日期:2011.11
(DMSO) and tBu2C=C=O in diglyme require heating to about 150 °C to furnish the Pummerer-type product tBu2CHCO2CH2SCH3 through a novel mechanistic variant. The “ester enolate” tBu2C=C(O–)–O–S+(CH3)2 arising through the reversible addition of DMSO (step 1) to C-1 of tBu2C=C=O must be trapped through protonation (step 2) at C-2 by a carboxylic acid catalyst to form tBu2CH–C(=O)–O–S+(CH3)2 so that the reaction