Method for producing 2-chloro-5-chloromethyl-1,3-thiazol
US6812348B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2002 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Apr 19, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/55
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a method for producing 2-chloro-5-chloromethyl-1,3-thiazol from compounds of formula (I), wherein X means Cl, —OR, —SR or NR2, R being H or a suitable protective group; Y means H or Cl and Z means Cl or O, the compounds of formula (I) having at most one double bond between C* and C″ or between C″ and Z, on the condition that the bond between C″ and Z is a double bond when Z is the same as O and a single bond when Z is the same as Cl; with the following intermediate stage: A1) reacting 2,3-dichloropropanal with rhodanide and acetalising to 3-chloro-1,1-dialkoxy-2-isothiocyanato-propane or a2) reacting 2,3-dichloropropanal with thiourea to form a mixture of the hydrochlorides of the compounds N-[[5-(2-aminothiazol)yl]methyl]thiourea and [5-(2-aminothiazol)yl]methylthioformamidine and splitting to obtain the corresponding thiol or amine or b) reacting a compound of formula (I) wherein X means OR, SR or NR2, Y means clorine and Z means oxygen with thiourea to produce the compound of formula (V), or c) reacting a compound of formula (I), wherein X means OR, SR or NR2, Y means chlorine and Z means oxygen with ammoniumdithiocarbamate …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.