The retinal analogues (13Z)-13-bromo-13-desmethylretinal (3) and (13E)-20,20,20-trifluororetinal (4) have been efficiently synthesized using the palladium-catalyzed cross-coupling of boronic acid 8 and electrophiles 9 and 10, respectively. For the first analogue, the coupling of 8 and the gem-dibromide 9 took place with high stereoselectivity. The configuration of the C13-C14 double bond in 4 relied
视网膜类似物(13Z)-1
3-溴-13- desmethylretinal(3)和(13 Ë)-20,20,20-trifluororetinal(4),使用已被有效地合成的
钯催化的
硼酸的交叉偶联8和亲电试剂9和10。对于第一个类似物,8和gem -dibromide 9的偶联具有很高的立体选择性。C13-C14双键在4中的构型取决于立体选择性制备和β-
酮酸酯15的
三氟甲磺酸Z - 10的偶联。