A convenient synthesis and structural analysis of novel 4,5,6,7-tetrahydro-1H-indazoles
摘要:
A new series of t-4-aryl-3,c-6-dihydroxy-6-methyl-4,5,6,7-tetrahydro-1H-indazole-r-5-carboxylic acid isopropyl esters has been synthesized by adopting a conventional method from cyclic beta-keto esters. H-1, C-13 NMR, and IR spectra for all the compounds were investigated. HMBC, HSQC, COSY, and NOESY spectra of the representative compounds were studied. The stereochemistry of a six-membered ring of the fused indazoles resembled that of keto esters. From the HMBC correlations the indazole structure was confirmed as 1H-indazole.
摘要 7 r(2), c (4)-bis(isopropoxycarbonyl)- t (3)-aryl- c (5)-hydroxy- t (5)-methylcyclohexones 7 – 13 (aryl = C 6 H 5 , p - ClC 6 H 4 , p -FC 6 H 4 , p -OMeC 6 H 4 , p -Me 2 NC 6 H 4 , m -O 2 NC 6 H 4 和 m -C 6 H 5 OC 6 H 4 )在甲胺存在下,乙酰乙酸异丙酯与芳香醛缩合而成。对于所有这些化合物,已记录了 1 H 和 13 C NMR 光谱。对于 7 ,还记录了 HOMOCOSY、NOESY、HSQC 和 HMBC 光谱。光谱数据表明化合物 7-13 以椅子构象存在,羟基为轴向取向,所有其他取代基均呈赤道取向。在所有情况下,OH 质子和 H(6a) 之间都观察到长距离耦合,表明 OH
Synthesis and conformational study of some r(2),c(4)-bis(isopropoxycarbonyl)-t(3)-aryl-c(5)-hydroxy-t(5)-methylcyclohexanones using NMR spectra
作者:K. Pandiarajan、R.T. Sabapathy Mohan、K. Murugavel、R. Hema
DOI:10.1016/j.molstruc.2007.04.033
日期:2008.3
Abstract Seven r(2), c (4)-bis(isopropoxycarbonyl)- t (3)-aryl- c (5)-hydroxy- t (5)-methylcyclohexanones 7 – 13 (aryl = C 6 H 5 , p -ClC 6 H 4 , p -FC 6 H 4 , p -OMeC 6 H 4 , p -Me 2 NC 6 H 4 , m -O 2 NC 6 H 4 and m -C 6 H 5 OC 6 H 4 ) have been synthesized by condensing isopropyl acetoacetate with aromatic aldehydes in the presence of methylamine. For all these compounds 1 H and 13 CNMR spectra have
摘要 7 r(2), c (4)-bis(isopropoxycarbonyl)- t (3)-aryl- c (5)-hydroxy- t (5)-methylcyclohexones 7 – 13 (aryl = C 6 H 5 , p - ClC 6 H 4 , p -FC 6 H 4 , p -OMeC 6 H 4 , p -Me 2 NC 6 H 4 , m -O 2 NC 6 H 4 和 m -C 6 H 5 OC 6 H 4 )在甲胺存在下,乙酰乙酸异丙酯与芳香醛缩合而成。对于所有这些化合物,已记录了 1 H 和 13 C NMR 光谱。对于 7 ,还记录了 HOMOCOSY、NOESY、HSQC 和 HMBC 光谱。光谱数据表明化合物 7-13 以椅子构象存在,羟基为轴向取向,所有其他取代基均呈赤道取向。在所有情况下,OH 质子和 H(6a) 之间都观察到长距离耦合,表明 OH
A convenient synthesis and structural analysis of novel 4,5,6,7-tetrahydro-1H-indazoles
作者:K. Murugavel、S. Amirthaganesan、R. T. Sabapathy Mohan
DOI:10.1007/s10593-010-0505-2
日期:2010.7
A new series of t-4-aryl-3,c-6-dihydroxy-6-methyl-4,5,6,7-tetrahydro-1H-indazole-r-5-carboxylic acid isopropyl esters has been synthesized by adopting a conventional method from cyclic beta-keto esters. H-1, C-13 NMR, and IR spectra for all the compounds were investigated. HMBC, HSQC, COSY, and NOESY spectra of the representative compounds were studied. The stereochemistry of a six-membered ring of the fused indazoles resembled that of keto esters. From the HMBC correlations the indazole structure was confirmed as 1H-indazole.