Reaction of Ketenes with N,N-disubstituted α-aminomethyleneketones, XIX. Synthesis of N,N disubstituted 4-amino-3-phenyl-2H-furo[2,3-h]-1-benzopyran-2-ones (4-amino-3-phenylangelicins). Crystal and molecular structure of 3-phenylangelicin

Article abstract of DOI:10.1002/jhet.5570250211

1,4-Cycloaddition of phenylchloroketene to N,N-disubstituted 5-aminomethylene-6,7-dihydrobenzo[b]-furan-4(5H)-ones gave the corresponding adducts, namely N,N-disubstituted 4-amino-3-chloro-3,4,5,6-tetrahydro-3-phenyl-2H-furo[2,3-h]-1-benzopy an-2-ones II,