Patent ID: 7417145

Claim:
An intermediate compound for total synthesis of ecteinascidins having a backbone of a five-membered ring structure of ecteinascidins comprising, a compound represented by formula 2 having an OH group at the C4 site, formula 2 wherein, Y is oxygen or NH, X 1 is hydrogen or a protecting group of an amino group or Ac, X 2 , X 3 and X 4 are independently selected from the group consisting of H or an alkyl group of carbon number 4 or less, alkoxyalkyl group, allyl group, or arylsulfonyl group, R 1 and R 4 are H or an alkyl group of carbon number 4 or less, R 2 is alkoxycarbonyl group which can be substituted by halogen, lower alkyl sulfonyl or aryl sulfonyl group, and R 3 is CN or OH.