South, Michael S., Journal of Heterocyclic Chemistry, 1991, vol. 28, # 4, p. 1003 - 1011
作者:South, Michael S.
DOI:——
日期:——
US5068343A
申请人:——
公开号:US5068343A
公开(公告)日:1991-11-26
Synthesis of 2,5-dihalothiazole-4-carboxylates
作者:John F Okonya、Fahad Al-Obeidi
DOI:10.1016/s0040-4039(02)01556-3
日期:2002.9
An efficient synthesis of 2,5-dihalothiazole-4-carboxylates has been described. Halogenation of aminothiazole carboxylate with NBS or NCS and subsequent diazotization with isoamyl nitrite and halogenation with CuBr2, CuCl2 or CH2I2, provided the corresponding diahalothiazole derivatives. The four-step process described is amenable to scale-up and requires 110 chromatographic purification in all the steps. (C) 2002 Published by Elsevier Science Ltd.
4-substituted 5-chloro-2-hydrazinothiazoles
申请人:Bayer Aktiengesellschaft
公开号:US05068343A1
公开(公告)日:1991-11-26
4-Substituted 5-chloro-2-hydrazinothiazoles of the formula ##STR1## in which R represents CHF.sub.2, CF.sub.3, CN or COOR.sup.1, where R.sup.1 represents C.sub.1 -C.sub.4 -alkyl. They are useful as pesticides and as intermediates for other pesticides.