4-Methylene-3,4-dihydro-2//-pyrido pyrimidines

Recently, the X-ray structures of ocaperidone 8 [92AX(C)1827], risperidone 7 [93AX(C)1698], and 4-methylene-3,4-dihydro-4//-pyrido[ 1,2-a] pyrimidine 49 (90DOK619) were reported (see Table VII). 

JA11707), 4-cyano-3-phenyl-3-trifluoromethyl-2,3-dihydro-lH-pyrido [l,2-c]pyrimidin-l-one (05MI1), and 10-(ferf-butyl)-3-methylene-3,4,4fl,5-tetrahydro-3H-[l,3]oxazino[3,4-b]isoquinolin-l-one (07EJ02015) under either acidic or basic conditions. 

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