作者:Wolfgang Kirmse、Pham van Chiem、Paul-Georg Henning
DOI:10.1016/s0040-4020(01)96385-9
日期:1985.1
opylidenes (95,97) were generated from the corresponding nitrosoureas in methanol at room temperature. The diazo route is initiated by the formation of 2-vinylcyclopropanediazonium ions (e.g.43) which do not undergo 1,3-carbon shifts. No cyclopentenyl products were found in weakly basic methanol where the diazonium ions prevail. Ring opening of the diazonium ions gives pentadienyl cations and products
Reaction of β-keto phenylsulphone tosylhydrazones 2 with 2 eq. of DBU, at r.t. in dichloromethane, affords α,β-unsaturated ketone tosylhydrazones 4, via the tosylazoalkenes 3 obtained by 1,4-elimination of benzenesulfinic acid.