the one-layer system containing water and DMF, Z(20)Csin catalyzed the peptide bond formation in a higher yield than that by unmodifide chymotrypsin and enabled a synthetic reaction in even an 80% (v/v) DMF media, in which the hydrolytic reaction could not be carried out. Z(20)Csin catalyzed the condensation between some N-acyl amino acids or peptide derivatives and amino acids in 90% ethylacetate,
for techniques of simplified peptide synthesis, benzyloxycarbonyl chymotrypsin was prepared by a water-soluble acylating reagent and used to make Ac-Phe-Lys, an artificial peptide sweetener, which was selected as a target compound. As a result of using chemically modified chymotrypsin, Lys can be coupled directly with Ac-Phe and Ac-Phe-Lys made virtually in onestep. Moreover, the total yield from preparation
[EN] ELONGATED AND MULTIPLE SPACERS IN ACTIVATIBLE PRODRUGS<br/>[FR] ESPACEURS ALLONGES ET MULTIPLES DE PRODROGUES ACTIVABLES
申请人:DE GROOT FRANCISCUS MARINUS HE
公开号:WO2002083180A1
公开(公告)日:2002-10-24
This invention is directed to prodrugs that can be activated at the preferred site of action in order to selectively deliver the corresponding therapeutic parent drugs to target cells or to the target site. This invention will therefore primarily but not exclusively relate to tumor cells as target cells. More specifically the prodrugs are compounds of the formula V-(W)k-(X)1-A-Z, wherein: V is a specifier; (W)k-(X)1-A is an elongated self-elimination spacer system; W and X are each a 1,(4+2n) electronic cascade spacer, being the same or different; A is either a spacer group of formula (Y)m wherein: Y is a 1,(4+2n) electronic cascade spacer, or a group of formula U being a cyclisation elimination spacer; Z is a therapeutic drug; k, 1 and m are integers from 0 (included) to 5 (included); n is an integer of 0 (included) to 10 (included), with the provisos that: - when A is (Y)m: k+1+m ≥ 1, and if k+1+m = 1; - when A is U: k+1 ≥ 1.
Elongated and multiple spacers in activatible produgs
申请人:——
公开号:US20040121940A1
公开(公告)日:2004-06-24
This invention is directed to prodrugs that can be activated at the preferred site of action in order to selectively deliver the corresponding therapeutic parent drugs to target cells or to the target site. This invention will therefore primarily but not exclusively relate to tumor cells as target cells. More specifically the prodrugs are compounds of the formula V—(W)k-(X)l-A-Z, wherein: V is a specifier; (W)k-(X)l-A is an elongated self-elimination spacer system; W and X are each a l,(4+2n) electronic cascade spacer, being the same or different; A is either a spacer group of formula (Y) m wherein: Y is a l,(4+2n) electronic cascade spacer, or a group of formula U being a cyclisation elimination spacer; Z is a therapeutic drug; k, l and m are integers from 0 (included) to 5 (included); n is an integer of 0 (included) to 10 (included), with the provisos that:—when A is (Y)m: k+l+m
1, and if k+l+m=1;—when A is U: k+l
1.