Singlet-Oxygen Ene Reactions of (E)-4-Propyl[1,1,-2H3]oct-4-ene. Short Communication
作者:Valentin Rautenstrauch、Walter Thommen、Karl H. Schulte-Elte
DOI:10.1002/hlca.19860690718
日期:1986.10.29
from 2. Accordingly, singlet oxygen ene additions at the disubstituted side of 2 are preferred (ca. 90%). The previously studied trisubstituted olefins 20–25 exhibited the same preference, but had both CH3 and higher alkyl substituents on the double bond. In these substrates, CH3 groups syn to the lone alkyl or CH3 group appear to be more reactive than CH2 groups at that site beyond a statistical bias
在MeOH / Me 2 CHOH 1:1(v / v)和MeOH / H 2 O 95:5中对4-丙基-4-辛烯(1)进行玫瑰孟加拉敏化光氧合,然后还原得到(E)-4-丙基-5-辛烯-4-醇(4),其(Z)异构体5,(E)-5-丙基-5-辛烯-4-醇(6),及其(Z)异构体7。类似地,(ê)-4-丙基[1,1,1- 2 H ^ 3 ]辛-4-烯(2),得到(ê)-4-丙基[1,1,1- 2 H ^ 3] oct-5-en-4-ol(14),其(Z)-异构体15,(E)-5- [3',3',3'- 2 H 3 ]丙基-5-辛烯-4-醇(16),其(ž) -异构体17,以及相应的[8,8,8- 2 H ^ 3 ] -异构体18和19(见方案1)。通过GC仔细确定了4–7的比例,转化率为1的10%至85%,并且在此范围内保持恒定。标记的基材2在两个高转化率实验中将其进行光氧化,还原后,通过NM