Quinazolin-2-ones having a spirohydantoin ring. II. Synthesis of several spiro(imidazolidine-4,4'(1'H)-quinazoline)-2,2',5(3'H)-triones via 5-hydroxyhydantoin derivatives.
A quinazolinone derivative of the formula: ##STR1## wherein R.sup.1 is hydrogen atom or a halogen atom, or a salt thereof and processes for preparing the same are disclosed. The quinazolinone derivative (I) is useful for treatment of diabetic complications.
Novel 3-acyloxymethyl-cephem compounds of the formula: ##STR1## wherein R.sup.1 is hydrogen or an acyl group; X is a divalent group consisting of a carbon chain having 2 to 3 carbon atoms and a carbonyl or sulfonyl group at one terminal end thereof, said divalent group being either substituted or unsubstituted on the carbon chain; and Z is an organic acid residue, and salts thereof were found to be useful as starting materials for preparing cephalosporins of the formula: ##STR2## wherein R.sup.2 stands for a residue of a nucleophilic compound and R.sup.1 has the same meaning as above.
P(NMe<sub>2</sub>)<sub>3</sub>-Mediated Umpolung Spirocyclopropanation Reaction of <i>p</i>-Quinone Methides: Diastereoselective Synthesis of Spirocyclopropane-Cyclohexadienones
作者:Yu-Hua Deng、Wen-Dao Chu、Yun-Han Shang、Ke-Yin Yu、Zhi-Long Jia、Chun-An Fan
DOI:10.1021/acs.orglett.0c02998
日期:2020.11.6
substitution offers a new method for effective access to a series of highly functionalized spirocyclohexadienonyl cyclopropanes having two vicinal quaternary carbons in ≤98% yield and >20:1 dr. Significantly, cyclic and acyclic topological structures of α-keto carbonyls as 1,1-dipole one-carbon synthons have a distinct influence on the stereochemistry of products, showing a reversal of diastereoselectivity
The stereoselective synthesis of a series of novel spiro-pyrrolidines and spiropyrrolizidines has been accomplished through an intermolecular 1,3-dipolar cycloaddition of an azomethineylides with dipolarophiles derivedfrom the Baylis-Hillman reaction of isatins with N-methyl maleimide.
Quinazolinone derivative and processes for preparing the same
申请人:TANABE SEIYAKU CO., LTD.
公开号:EP0269378A1
公开(公告)日:1988-06-01
A quinazolinone derivative of the formula:
wherein R¹ is hydrogen atom or a halogen atom, or a salt thereof and processes for preparing the same are disclosed. The quinazolinone derivative (I) is useful for treatment of diabetic complications.