POCOP钳形氢化镍镍配合物[2,6-(R 2 PO)2 C 6 H 3 ] NiH(R = i Pr,4a ; R = c Pe =环戊基,4b)与苯乙炔反应生成[2,6- (R 2 PO)2 C 6 H 3 ] NiC(Ph)CH 2(5a–b)为主要产物,而(E)-[2,6-(R 2 PO)2 C 6 H 3 ] NiCH CHPh(6a–b)作为次要产品。2,1插入比1,2插入更有利,并且两种途径都涉及通过C C键顺式添加Ni–H 。与钯不同,在镍体系中不会生成炔基络合物[2,6-(R 2 PO)2 C 6 H 3 ] NiC CPh(7a–b)和H 2。更大体积的氢化物配合物[2,6-(t Bu 2 PO)2 C 6 H 3 ] NiH(4c)对苯基乙炔没有反应性。4a–b催化苯乙炔加氢发生在高温下(70–100°C),并且证明是异质的。的结构图5b,图6a,图7a和7b中已经研究了通过X射线晶体学。
Synthesis applications of aza-Cope rearrangements. 12. Applications of cationic aza-Cope rearrangements for alkaloid synthesis. Stereoselective preparation of cis-3a-aryloctahydroindoles and a new short route to Amaryllidaceae alkaloids
作者:Larry E. Overman、Leah T. Mendelson、E. Jon Jacobsen
DOI:10.1021/ja00360a014
日期:1983.10
Synthese d'aryl-3a perhydro indolinones-4(A) a partir d'amino-2 aryl-1' vinyl-1 cyclopentanols; application a la synthese de crinine par l'intermediaire de A avec aryl=benzodioxole-1,3yl-5
合成这些 d'aryl-3a perhydroindolinones-4(A) a partir d'amino-2 aryl-1'vinyl-1 cyclopentanols; 应用 a la 合成 de crinine par l'intermediaire de A avec aryl=benzodioxole-1,3yl-5
Ring-closing metathesis for the synthesis of heteroaromatics: evaluating routes to pyridines and pyridazines
作者:Timothy J. Donohoe、John F. Bower、José A. Basutto、Lisa P. Fishlock、Panayiotis A. Procopiou、Cedric K.A. Callens
DOI:10.1016/j.tet.2009.07.076
日期:2009.10
Ring-closing olefin metathesis (RCM) has been applied to the efficient synthesis of densely and diversely substituted pyridine and pyridazine frameworks. Routes to suitable metathesis precursors have been investigated and the scope of the metathesis step has been probed. The metathesis products function as precursors to the target heteroaromatic structures via elimination of a suitable leaving group, which
A Facile Approach to 2-CF<sub>3</sub>-Substituted Seven-membered Oxacycles via Stereoselective Preparation and Cope Rearrangement of 2-CF<sub>3</sub>-<i>cis</i>-2,3-Bis(alkenyl)oxiranes
Stereoselective preparation and Cope rearrangement of 2-CF3-substituted cis-2,3-bis(alkenyl)oxiranes provides a convenient route to a diverse of 2-CF3-4,5-dihydrooxepins. The reaction sequence followed by reduction or oxidation provides 2-CF3-substituted oxepanes or oxepins, respectively.
Synthesis applications of aza-cope rearrangements.
作者:Larry E Overman、E.Jon Jacobsen
DOI:10.1016/s0040-4039(00)87445-6
日期:——
Both - and -3a-aryl-4-oxo-decahydrocyclohepta[b]pyrroles can be prepared in stereocontrolled fashions by the reaction of 2-amino-1-(1-phenyl- vinyl)cyclohexanols with formaldehyde and acid.
Chelate control in the rhodium-catalysed homogeneous hydrogenation of chiral allylic and homoallylic alcohols
作者:John M. Brown、Ramachandra G. Naik
DOI:10.1039/c39820000348
日期:——
Chelate bisphosphine rhodium complexes afford a high degree of stereoselection in the homogeneoushydrogenation of 3-phenylbut-3-en-2-ol and 4-phenylpent-4-en-2-ol in opposite senses.