N-氰亚胺基-S,S-二硫代碳酸二甲酯 、 炔丙胺 以
乙腈 为溶剂,
反应 16.0h,
以Workup gave 13.58 g (85%) of N-cyano-N'-(2-propyn-1-yl)-S-methylisothiourea的产率得到1-cyano-2-methyl-3-propargylisothiourea
a methyl group at the N-3 position of the functional group. Among them, the three thiourea derivatives (24, 26, and 38) and the six 2-cyanoguanidine derivatives (61, 62, 65, 75, 85, and 86) had the most potent antisecretory and/or antiulcer activities. These compounds are not histamineH2-receptorantagonists.
potent inhibitor of neuraminidases, a hydrolase that is responsible for processing sialylated glycoconjugates, is a promising drug candidate for various infective diseases. The current study demonstrates that the use of an aglycone-focused library of 2-difluoromethylphenyl α-sialosides is an effective technique to find potent and selective mechanism-basedlabeling reagents for neuraminidases. The focused
Compounds of the formula ##STR1## wherein R.sup.1 is a straight or branched chain alkynyl group containing from 3 to 9 carbon atoms, inclusive, and nontoxic pharmaceutically acceptable acid addition salts thereof, are potent anti-ulcer agents.
Novel compounds of the formula ##STR1## wherein each R.sup.1 is the same and is a straight or branched chain alkynyl group containing from 3 to 9 carbon atoms, inclusive, which are useful intermediates in the preparation of anti-ulcer agents, are prepared by reacting cystamine (VI) with an N-cyano-N'-alkynyl-S-methylisothiourea of the formula ##STR2## in which R.sup.1 is as defined above.
Anti-ulcer agents of the formula ##STR1## wherein R.sup.1 is a straight or branched chain alkynyl group containing from 3 to 9 carbon atoms, inclusive, and non-toxic pharmaceutically acceptable acid addition salts thereof, are prepared by reacting a compound of the formula ##STR2## with a compound of the formula ##STR3## wherein R.sup.1 is as defined above and R.sup.5 is (lower)alkyl, phenylalkyl or phenyl containing 1 or 2 substituents independently selected from nitro, chloro and bromo. The intermediates of Formula IV may be prepared by reacting the desired alkynylamine with a compound of the formula (R.sup.5 S).sub.2 C.dbd.NCN V in which R.sup.5 is as described above.