Efficient and Simple Synthesis of Substituted 3‐Phenyl‐7‐methoxybenzopyrans as Pseudo‐Vitamin‐D3 Analogs

An efficient and simple synthesis of substituted 3‐phenyl‐7‐methoxybenzopyrans as pseudo‐vitamin‐D₃ analogs in good yields under mild reaction conditions is described.     

反式-3-羟基-4-胺基苯并吡喃乙酰化物的合成及其血管舒张活性

以3-乙酰基-4-羟基苯腈为原料,经环合、还原、脱水、环氧化、氨基开环和乙酰化等反应合成了15种反式-3-羟基-4-胺基苯并吡喃及其乙酰化衍生物,其结构经IR1、H NMR、MS和元素分析测试技术确证。大鼠体外血管扩张实验研究表明,多数化合物在1.0μmol/L浓度下对30 mmol/L KC l诱导的大鼠主动脉条收缩具有一定程度的抑制作用,其中化合物7d的血管收缩抑制活性较强。初步构效关系研究表明,C-4位单乙酰化的衍生物的活性强于C-3和C-4位未乙酰化和双乙酰化的化合物。     

Solid-phase synthesis: a linker for side-chain anchoring of arginine

A new linker based on a chroman system is described for the side-chain anchoring of Arg and other guanidine-containing molecules. The system is compatible with the Fmoc/tBu solid-phase strategy, because the release of the final product is achieved by treatment with TFA in the presence of scavengers.