1-Benzylwye (3) underwent substitution at the 7-position in the presence of COCl2 and pyridine in THF to afford various products depending upon the post-treatment through 1,4-dihydropyridine (7) and carboxylic acid derivative (8). When Et3N was used instead of pyridine, it reacted with COCl2 to provide two enamines (18 and 19), together with diethylcarbamyl chloride (20), after treatment of the reaction mixture with MeOH.
The kinetic and activation parameters for the rotation about the CC double bond and the C-N single bond in the compounds listed in Table 1 were determined by variable temperature NMR spectroscopy. Complete line shape analyses, using a computer REEP program, were carried out on several systems. The main objective of the present study is to determine the effect of the ring size in II on the two types
Reaction of Phosgene with the Tricycle Related to the Minor Base of Phenylalanine Transfer Ribonucleic Acids.
作者:Taisuke Itaya、Tae Kanai
DOI:10.1248/cpb.50.1584
日期:——
electrophilic substitution at the 7-position in the presence of phosgene and pyridine in tetrahydrofuran (THF) to afford the 1,4-dihydropyridines (11, 10, and 14) together with the carboxylic acid 6 and its methyl ester 2 after short treatment of the reaction mixture with methanol and then with water. When triethylamine was used instead of pyridine, phosgene reacted with triethylamine rather than 8, producing