Mn(III)-based oxidative free radical cyclizations of unsaturated 2-cyclohexenones and aldehydes
作者:Barry B Snider、Eugenia Y Kiselgof
DOI:10.1016/0040-4020(96)00234-7
日期:1996.4
Oxidative free-radical cyclizations of unsaturated 2-cyclohexenones 9a, 9b, 17, and 24 with Mn(OAc)3 afford unsaturated α′-keto radicals such as 10 that cyclize to afford bicyclic products. The major process with 2-cyclohexenone 27 is conjugate addition of acetate to form β-acetoxy α-keto radical 37. Unsaturatedaldehydes 45, 57a, and 57b are oxidized to radicals that cyclize to give cyclopentane- and
ROBERTSON, I. R.;SHARP, J. T., TETRAHEDRON, 1984, 40, N 16, 3095-3112
作者:ROBERTSON, I. R.、SHARP, J. T.
DOI:——
日期:——
A study of periselectivity in the thermal cyclisation reactions of diene-conjugated diazo compounds: 1,7-cyclisation as a route to 3H-1,2-diazepines and 1,5-cyclisation leading to new rearrangement reactions of 3H-pyrazoles
作者:Ian R. Robertson、John T. Sharp
DOI:10.1016/s0040-4020(01)82434-0
日期:1984.1
A range of diene-conjugated diazo compounds has been generated by the thermal decomposition of the sodium salts of the tosylhydrazones of 1-acyl-1, 3-dienes. Those of type (21) with a relationship of the diazo group and the γ, δ-double bond having a hydrogen atom at the diene terminus cyclised only by 1,7 ring closure to give 3-1,2-diazepines (23). This mode of cyclisation was inhibited by the presence
Enantioselective Hydroalkenylation and Hydroalkynylation of Alkenes Enabled by a Transient Directing Group: Catalyst Generality through Rigidification**
作者:Amit Kumar Simlandy、Turki M. Alturaifi、Johny M. Nguyen、Lucas J. Oxtoby、Quynh Nguyen Wong、Jason S. Chen、Peng Liu、Keary M. Engle
DOI:10.1002/anie.202304013
日期:2023.7.17
Use of tert-leucine as a chiral transient directing group enables the enantioselective reductive-Heck-type hydroalkenylation and hydroalkenylation of alkenyl benzaldehydes under palladium catalysis. The dual catalytic reaction proceeds under mild conditions and offers high enantioselectivity.