Palladium-Catalyzed Intramolecular Asymmetric Hydroamination, Hydroalkoxylation, and Hydrocarbonation of Alkynes
摘要:
A conceptually novel approach for asymmetric intramolecular hydroamination, hydroalkoxylation and hydrocarbonation of alkynes using chiral palladium catalysts are described. The reactions of the aminoalkynes 5, alkynols 7, and alkynylmethines 9 in the presence of Pd-2(dba)(3)center dot CHCl3/PhCOOH/renorphos 4 in benzene (or benzene-hexane) at 100 degrees C gave the corresponding cyclization products (nitrogen heterocycles 6, oxygen heterocycles 8, and carbocycles 10) in good yields with good enantioselectivities. The origins of enantioselectivities in the hydroamination reaction are discussed based on DFT computations.
Palladium/Acetic Acid Catalyzed Allylation of Some Pronucleophiles with Simple Alkynes
作者:Isao Kadota、Akinori Shibuya、Young Soo Gyoung、Yoshinori Yamamoto
DOI:10.1021/ja981299c
日期:1998.10.1
Palladium-Catalyzed Intramolecular Asymmetric Hydroamination, Hydroalkoxylation, and Hydrocarbonation of Alkynes
作者:Nitin T. Patil、Léopold Mpaka Lutete、Huanyou Wu、Nirmal K. Pahadi、Ilya D. Gridnev、Yoshinori Yamamoto
DOI:10.1021/jo0603835
日期:2006.5.1
A conceptually novel approach for asymmetric intramolecular hydroamination, hydroalkoxylation and hydrocarbonation of alkynes using chiral palladium catalysts are described. The reactions of the aminoalkynes 5, alkynols 7, and alkynylmethines 9 in the presence of Pd-2(dba)(3)center dot CHCl3/PhCOOH/renorphos 4 in benzene (or benzene-hexane) at 100 degrees C gave the corresponding cyclization products (nitrogen heterocycles 6, oxygen heterocycles 8, and carbocycles 10) in good yields with good enantioselectivities. The origins of enantioselectivities in the hydroamination reaction are discussed based on DFT computations.
Synthese carbocyclisch anellierter Pyridazine durch intramolekulareDiels-Alder-Reaktion mit inversem Elektronenbedarf
作者:Xiao-Guang Yang、Gunther Seitz
DOI:10.1002/ardp.19923250906
日期:——
Die Titelreaktion mit einer Reihe von Tetrazinen 5, die mit verschiedenen ω‐Alkin‐Seitenkettendienophilen versehen sind, führt in guten Ausbeuten zu den bisher unbekannten, carbocyclisch anellierten Pyridazinen 7–10.