Synthesis and Structure of Some 6,7-Dihydro-thiazolo[4,5- d ][1,3,2]diaza-λ 5 -phosphorines
摘要:
1,2,4-Thiadiazol-5(2H)-imines 1 react with malononitrile under ring cleavage cycloaddition and subsequent ring rearrangement. The products 2 incorporate the enaminonitrile fragment. Treatment of compounds 2 with phosphorus pentachloride results in thiazolo[4,5-d][1,3,2]diaza-lambda(5)-phosphorine derivatives 3 with a reactive chloro, substituent in position 2 and 4 which can be substituted by various nucleophiles. The structure of the trimethoxy derivative 7c was determined by an X-ray structure analysis.