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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 47, Number 1
JKCSEZ 47(1)
February 20, 2003 

 
Title
Synthesis of New 2,4-Diimino-1,3-thiazoles and the Structure Determination

새로운 2,4-Diimino-1,3-thiazoles 유도체의 합성과 구조 결정
Author
Hoh-Gyu Hahn, Chul-Soo Lim, Heduck Mah

한호규, 임철수, 마혜덕
Keywords
아이소테리즘, 농약 살균제, Isosterism, Agrochemical Fungicide
Abstract
신농약 개발을 목적으로 isosterism 이론을 근거로 하여 선도화합물, 2-imino-1,3-thiazoline의 분자 수정을 통하여 분자내에 1,3-thiazole과 urea기가 포함된 새로운 화합물 2를 디자인하였다. N-Methylthiourea 5와 bromoacetonitrile을 에탄올 용액 중에서 반응시켜 위치 선택적으로 생성된 2,4-diimino-1,3-thiazole 4를 phenylisocyanate 유도체와 반응하여 화합물 2의 tautomer인 7을 얻었고 이것의 구조를 여러 가지 스펙트럼(1H NMR, 13C NMR, FT-IR, HRMS)과 X-ray 결정 데이터로부터 확인하였다. 화합물 7의 구조이성질체 8은 열역학적으로 불안정한 중간체 2,4-diimino-1,3-thiazole 6을 통하여 생성되었다.

For the purpose of developing new agrochemical fungicides, compound 2 possessing 1,3-thiazole scaffold as well as urea moiety in the structure was designed through molecular modification of lead compound, 2-imino-1,3-thiazoline based on isosterism. The reaction of N-methylthiouea 5 and bromoacetonitrile in ethanol gave 2,4-diimino-1,3-thiazole 4 regioselectively, which was treated with phenyl isocyanates to give the corresponding 7 which is tautomer of 2. The structural assignment of 7 was confirmed by various spectra(1H NMR, 13C NMR, FT-IR, HRMS), and X-ray crystallographic data. Compound 8 which is a structural isomer of 7 was formed through thermodynamically unstable intermediate 2,4-diimino-1,3-thiazole 6.

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