The direct chemical derivatization of natural plant extracts that would enable the straightforward synthesis of natural plant-like molecules seemed to be far from reality due primarily to the inherently complex chemical property of the extract. After model studies, the envisioned derivatization was realized under the rationally designed Bucherer–Bergs reaction conditions to afford unnatural hydantoin
Cyclopeptide, pharmaceutical or cosmetic composition comprising the same and method for preparing the same
申请人:National Tsing Hua University
公开号:US20180298060A1
公开(公告)日:2018-10-18
A cyclopeptide is disclosed, which is represented by the following formula (I) or (I′):
wherein R
1
is defined in the specification. In addition, a pharmaceutical or cosmetic composition comprising the same and a method for preparing the same are also disclosed.
A cyclopeptide is disclosed, which is represented by the following formula (I) or (I'):
wherein R1 and G' are defined in the specification. In addition, a pharmaceutical or cosmetic composition comprising the same and a method for preparing the same are also disclosed.
A method for preparing a cyclopeptide, which includes the following steps: (A) providing compounds represented by the following formulas (II-1) or (II′-1) and (II-2); (B) performing a reaction between the compounds of formulas (II-1) or (II′-1) and (II-2), to obtain a compound represented by the following formula (II-3) and (II′-3), respectively; (C) performing a reaction between the compound of formula (II-3) or (II′-3) and a compound represented by the following formula (II-4) or (II′-4), respectively, is performed, to obtain a compound represented by the following formula (II-5), and (II′-5), respectively; (D) performing a cyclization reaction of the compound of formula (II-5) or (II′-5) with a catalyst of formula (III), to obtain a compound represented by the following formula (I) or (I′), respectively. The formulas (I), (I′), (II-1) to (II-5), (II′-1) to (II′-5) and (III) are shown in the specification.