作者:Xudong Jin、Anthony Linden、Hans-J�rgen Hansen
DOI:10.1002/hlca.200590065
日期:2005.4
shown that 4,8-diphenylazulene (1) can be easily prepared from azulene by two consecutive phenylation reactions with PhLi, followed by dehydrogenation with chloranil. Similarly, a Me group can subsequently be introduced with MeLi at C(6) of 1 (Scheme 2). This methylation led not only to the expected main product, azulene 2, but also to small amounts of product 3, the structure of which has been determined
结果表明,通过与PhLi的两个连续的苯基化反应,然后用氯乙腈进行脱氢,可以很容易地从a烯制备4,8-二苯基az烯(1)。类似地,Me基团随后可以用在的MeLi的C(6)引入1(方案2)。这种甲基化不仅导致预期的主要产物氮杂2,而且导致少量的产物3,其结构已通过X射线晶体结构分析确定(参见图1)。如所预期的,后一种产物在40℃下在Et 2 O中与氯腈反应,以定量收率得到2。Vilsmeier甲酰化11和2导致形成相应的azulene-1-carbaldehydes 4和5。用二甘醇二甲醚/ Et 2 O 1:1中的NaBH 4 / BF 3 · OEt 2和BF 3 · OEt 2还原4和5,分别得到1-甲基azulenes 6和7。以同样的方式通过Vilsmeier甲磺酰化从6中获得了Azulene 9,然后还原了Azulene-1-carbaldehyde 8(方案3 )。天青石1