Design and synthesis of a new indazole library: direct conversion of N-methoxy-N-methylamides (Weinreb amides) to 3-keto and 3-formylindazoles
作者:François Crestey、Silvia Stiebing、Rémi Legay、Valérie Collot、Sylvain Rault
DOI:10.1016/j.tet.2006.10.063
日期:2007.1
Grignard or lithiated reagents on the new Weinreb amides 3 and 4 afforded efficiently the corresponding ketones and allowed the design and synthesis of a new indazole library. These 3-ketoindazoles were obtained by a direct and original conversion of N-methoxy-N-methylamides with good yields. Furthermore, the reduction of 3 with LiAlH4 furnished the corresponding aldehydes as a versatile and efficient pathway
在新的Weinreb酰胺3和4上亲核添加格氏试剂或锂化试剂可有效提供相应的酮,并允许设计和合成新的吲唑文库。这些3-酮吲唑是通过N-甲氧基-N-甲基酰胺的直接和原始转化以良好的收率获得的。此外,用LiAlH 4还原3可以提供相应的醛,作为通向3-甲酰基吲唑的一种通用而有效的途径。