Stereoselective radical cascade approach to benzo[a]quinolizidines
摘要:
The treatment of enamide 15, having an (E)-4-ethoxycarbonyl-3-butenyl group on the nitrogen atom. with Bu3SnH-AIBN in boiling benzene, afforded a 1.2:1 mixture of two benzo[a] quinolizidine stereoisomers 16 and 17 as a result of cascade radical cyclization. A similar treatment of the (2)-4-ethoxycarbonyl-3-butenyl congener 19 gave 16 and 17 in a ratio of 3.4:1. The high stereoselectivity (16:17 = 37:1) from 19 was obtained using Et3B as the initiator at -78 degrees C in toluene. (C) 1999 Elsevier Science Ltd. All rights reserved.
Stereoselective radical cascade approach to benzo[a]quinolizidines
摘要:
The treatment of enamide 15, having an (E)-4-ethoxycarbonyl-3-butenyl group on the nitrogen atom. with Bu3SnH-AIBN in boiling benzene, afforded a 1.2:1 mixture of two benzo[a] quinolizidine stereoisomers 16 and 17 as a result of cascade radical cyclization. A similar treatment of the (2)-4-ethoxycarbonyl-3-butenyl congener 19 gave 16 and 17 in a ratio of 3.4:1. The high stereoselectivity (16:17 = 37:1) from 19 was obtained using Et3B as the initiator at -78 degrees C in toluene. (C) 1999 Elsevier Science Ltd. All rights reserved.
Acrylonitrile Derivatives from Epoxide and Carbon Monoxide Reagents
申请人:Novomer, Inc.
公开号:US20190002400A1
公开(公告)日:2019-01-03
The present invention is directed to reactor systems and processes for producing acrylonitrile and acrylonitrile derivatives. In preferred embodiments of the present invention, the processes comprise the following steps: introducing an epoxide reagent and carbon monoxide reagent to at least one reaction vessel through at least one feed stream inlet; contacting the epoxide reagent and carbon monoxide reagent with a carbonylation catalyst to produce a beta-lactone intermediate; polymerizing the beta-lactone intermediate with an initiator in the presence of a metal cation to produce a polylactone product; heating the polylactone product under thermolysis conditions to produce an organic acid product; optionally esterifying the organic acid product to produce one or more ester products; and reacting the organic acid product and/or ester product with an ammonia reagent under ammoxidation conditions to produce an acrylonitrile product.
Acrylonitrile derivatives from epoxide and carbon monoxide reagents
申请人:Novomer, Inc.
公开号:US10676426B2
公开(公告)日:2020-06-09
The present invention is directed to reactor systems and processes for producing acrylonitrile and acrylonitrile derivatives. In preferred embodiments of the present invention, the processes comprise the following steps: introducing an epoxide reagent and carbon monoxide reagent to at least one reaction vessel through at least one feed stream inlet; contacting the epoxide reagent and carbon monoxide reagent with a carbonylation catalyst to produce a beta-lactone intermediate; polymerizing the beta-lactone intermediate with an initiator in the presence of a metal cation to produce a polylactone product; heating the polylactone product under thermolysis conditions to produce an organic acid product; optionally esterifying the organic acid product to produce one or more ester products; and reacting the organic acid product and/or ester product with an ammonia reagent under ammoxidation conditions to produce an acrylonitrile product.
The treatment of enamide 15, having an (E)-4-ethoxycarbonyl-3-butenyl group on the nitrogen atom. with Bu3SnH-AIBN in boiling benzene, afforded a 1.2:1 mixture of two benzo[a] quinolizidine stereoisomers 16 and 17 as a result of cascade radical cyclization. A similar treatment of the (2)-4-ethoxycarbonyl-3-butenyl congener 19 gave 16 and 17 in a ratio of 3.4:1. The high stereoselectivity (16:17 = 37:1) from 19 was obtained using Et3B as the initiator at -78 degrees C in toluene. (C) 1999 Elsevier Science Ltd. All rights reserved.