Dicoordinated 2H-phospholes as transient intermediates in the reactions of tervalent phospholes at high temperature. One-step syntheses of 1-phosphanorbornadienes and phosphorins from phospholes
The chemical compound 3,4-dimethyl-2,5,6-tris(p-sulfonatophenyl)-1-phosphanorbernadiene, a process for the preparation thereof and a process for the hydroformylation of olefinically unsaturated compounds with the use of catalysts which contain the aforementioned chemical compound.
N-2-(Phthalimido)ethyl trans-piperidine-2,5-dicarboxylates as intermediates in the preparation of perhydro-1H-pyrido[1,2-a]pyrazines
申请人:PFIZER INC.
公开号:EP0737683A1
公开(公告)日:1996-10-16
Compounds of the formula
wherein R is (C1-C3)alkyl, are intermediates for use in the preparation of certain neuroleptic, racemic or optically active perhydro-1H-pyrido [1,2-a] pyrazines.
式中的化合物
其中 R 为(C1-C3)烷基,是用于制备某些神经性、外消旋或光学活性全氢-1H-吡啶并[1,2-a] 吡嗪的中间体。
Hetero-Diels−Alder Reactions of 2<i>H</i>-Phospholes with Aldehydes
作者:Patrick Toullec、Louis Ricard、François Mathey
DOI:10.1021/jo020720j
日期:2003.4.1
Transient 2-phenyl-3,4-dimethyl-5H-phosphole reacts at 150 degreesC with aldehydes RCH=O to give the corresponding [4 + 2] P-O cycloadducts with endo- (major) and exo-R-substituents. The cycloaddition with alpha,beta-unsaturated aldehydes takes place both at the C=O (major) and C=C bonds. Upon heating under reduced pressure, the benzaldehyde cycloadduct dissociates to give back the 2H-phosphole, which either dimerizes, is trapped by diphenylacetylene, or is deprotonated by (BuOK)-Bu-t.
MATHEY F.; MERCIER F.; CHARRIER C.; FISCHER J.; MITSCHLER A., J. AMER. CHEM. SOC., 1981, 103, NO 15, 4595-4597
作者:MATHEY F.、 MERCIER F.、 CHARRIER C.、 FISCHER J.、 MITSCHLER A.
DOI:——
日期:——
PROCESS FOR PREPARING TRANS-PIPERIDINE-2,5-DICARBOXYLATES