Antiosteoporotic diarylheptanoids (−)-diospongins A (1) and B (2) were synthesized stereoselectively. The key steps in the synthesis include a stereospecific PdII-catalyzed cyclization of chiral 1,5,7-trihydroxy-2-heptenes, 6a and 6b, to form cis and trans tetrahydropyran rings and a regioselective Wacker oxidation of β-(tetrahydro-2H-pyran-2-yl)styrenes, 5a and 5b. Their C-5 epimers 3 and 4 were also
立体选择性地合成了抗骨质疏松症的二芳基
庚烷类化合物(-)-双鞘脂A(1)和B(2)。合成的关键步骤包括手性1,5,7-三羟基-
2-庚烯6a和6b的立体定向Pd II催化环化反应,形成顺式和反式
四氢吡喃环,以及β-(四氢- 2 H-
吡喃-2-基)
苯乙烯5a和5b。还合成了它们的C-5差向异构体3和4。