苄基锌试剂以较高的区域选择性加入衍生自吡啶-3-羧甲醛(1a)或3-乙酰吡啶(1b)的1-(苯氧羰基)盐,生成1-(苯氧羰基)-4-苄基-1,4-二氢吡啶-3 -羧醛5a,5c或酮5b,5d。这些二氢类似物与硫的芳香化反应导致相应的醛6a,6c或酮6b,6d。醛前体的另一合成涉及将苄基锌试剂添加到由烟碱甲酯形成的1-(苯氧羰基)盐中,这导致相应的1-(苯氧羰基)-4-苄基-1,4-二氢烟碱甲酯7a,7b。7a,7b的芳香化生成相应的吡啶酯8a,8b,然后将其用氢化铝锂还原,得到相应的甲醇9a,9b。用二氧化锰氧化9a,9b得到醛6e,6f。在多磷酸中加热时,醛6a-f容易转化为苯并[ g ]异喹啉10a-f。
苄基锌试剂以较高的区域选择性加入衍生自吡啶-3-羧甲醛(1a)或3-乙酰吡啶(1b)的1-(苯氧羰基)盐,生成1-(苯氧羰基)-4-苄基-1,4-二氢吡啶-3 -羧醛5a,5c或酮5b,5d。这些二氢类似物与硫的芳香化反应导致相应的醛6a,6c或酮6b,6d。醛前体的另一合成涉及将苄基锌试剂添加到由烟碱甲酯形成的1-(苯氧羰基)盐中,这导致相应的1-(苯氧羰基)-4-苄基-1,4-二氢烟碱甲酯7a,7b。7a,7b的芳香化生成相应的吡啶酯8a,8b,然后将其用氢化铝锂还原,得到相应的甲醇9a,9b。用二氧化锰氧化9a,9b得到醛6e,6f。在多磷酸中加热时,醛6a-f容易转化为苯并[ g ]异喹啉10a-f。
Regioselective Reaction of 2-Indolylcyanocuprates with Electrophiles
作者:Minoru Ishikura、Reina Uemura、Koji Yamada、Reiko Yanada
DOI:10.3987/com-06-10865
日期:——
The reaction of 2-indolylcyanocuprate with electrophiles was found to give rise to 2- and 3-substituted indoles in regioselective manner.
Synthesis of 1,4-Dihydropyridines by Regioselective Additions of Benzylic Zinc Bromides to Pyridinium Salts and Their Aromatizations to 4-Benzylpyridines
作者:A. Paul Krapcho、David J. Waterhouse、Abdelhakim Hammach、Roberto Di Domenico、Ernesto Menta、Ambrogio Oliva、Silvano Spinelli
DOI:10.1080/00397919708004198
日期:1997.3
Benzylic zinc reagents add with high regioselectivity to 1-(phenoxycarbonyl) salts of methyl nicotinate to yield methyl-1-(phenoxylcarbonyl)-4-benzyl-1,4-dihydronicotinates. The dihydronicotinates on heating with sulfur in decalin afford methyl 4-benzyinicotinates.
ISHIKURA, MINORU;TERASHIMA, MASANAO, J. CHEM. SOC. CHEM. COMMUN.,(1989) N1, C. 727-728
作者:ISHIKURA, MINORU、TERASHIMA, MASANAO
DOI:——
日期:——
COMINS, D. L.;ABDULLAH, ABDUL, H., J. ORG. CHEM., 1984, 49, N 18, 3392-3394