Asymmetric Diels-Alder reactions of a nitroso compound derived from D-bornane-10,2-sultam
摘要:
Acylnitroso dienophile 3 derived from D-bornane-10,2-sultam undergoes cycloaddition with high yields and complete facial selectivity to cyclopentadiene and cyclohexadiene. When the nitroso group is attached to the sultam nitrogen, it is no longer reactive in Diels-Alder reactions.
Asymmetric Diels-Alder reactions of a nitroso compound derived from D-bornane-10,2-sultam
摘要:
Acylnitroso dienophile 3 derived from D-bornane-10,2-sultam undergoes cycloaddition with high yields and complete facial selectivity to cyclopentadiene and cyclohexadiene. When the nitroso group is attached to the sultam nitrogen, it is no longer reactive in Diels-Alder reactions.
A formalasymmetricsynthesis of (−)-epibatidine is reported. The key step of the synthesis is a regio- and diastereoselective cycloaddition of silyloxycyclohexadiene with the acylnitroso dienophile derived from (+)-camphorsultam. The resulting cycloadduct was readily transformed into the N-protected-7-azabicyclo[2.2.1]heptan-2-one derivative which has previously been transformed into (−)-epibatidine
A series of new enantiomerically pure acylnitroso compounds have been prepared and tested as dienophiles for the asymmetric oxyamination of dienes. Very high selectivities were obtained with acylnitroso compounds derived from diphenylmethoxymethyl pyrrolidine 2c, the C-2-symmetric pyrrolidines 2d-e and camphorsultam 2f. (C) 1998 Elsevier Science Ltd. All rights reserved.
Asymmetric Diels-Alder reactions of a nitroso compound derived from D-bornane-10,2-sultam
作者:Véronique Gouverneur、Georges Dive、Léon Ghosez
DOI:10.1016/s0957-4166(00)80015-4
日期:1991.1
Acylnitroso dienophile 3 derived from D-bornane-10,2-sultam undergoes cycloaddition with high yields and complete facial selectivity to cyclopentadiene and cyclohexadiene. When the nitroso group is attached to the sultam nitrogen, it is no longer reactive in Diels-Alder reactions.