我们合成了黄精酸和毛甘酸 D 的结构。这两种天然产物的核心部分是通过在钯催化剂存在下将乙酸加成到 α,β-不饱和环氧醇中而立体选择性地构建的。随后,通过几个步骤从中间体合成了两种天然产物。合成的黄精酸的数据与报道的数据非常吻合。木瓜酸在1 H 和13 C NMR 数据中与天然产物非常一致,但在旋光度方面不一致。还合成了木瓜酸的 15 R异构体,但1 H 和13 C NMR 数据与天然产物不一致。
我们合成了黄精酸和毛甘酸 D 的结构。这两种天然产物的核心部分是通过在钯催化剂存在下将乙酸加成到 α,β-不饱和环氧醇中而立体选择性地构建的。随后,通过几个步骤从中间体合成了两种天然产物。合成的黄精酸的数据与报道的数据非常吻合。木瓜酸在1 H 和13 C NMR 数据中与天然产物非常一致,但在旋光度方面不一致。还合成了木瓜酸的 15 R异构体,但1 H 和13 C NMR 数据与天然产物不一致。
Sigmatropicrearrangements of 3‐(N‐tosylamino)allylic alcohol derivatives, a particular subclass of functionalized enamides, have been investigated. Whereas the presence of the nitrogen atom alters the stereochemical outcome of Ireland–Claisen rearrangements of glycolates derived from such substrates, [2,3]‐Wittig rearrangements of α‐allyloxy acetamides or propargylic ethers derivatives provide access
endogenous mediator to resolve inflammation, was synthesized by Wittig reaction between the C15–C20 aldehyde and the C10–C14 phosphonium salt possessing the vinyl iodo moiety followed by Suzuki–Miyaura coupling of the resulting vinyl iodide with the vinyl borane of the C1–C9 part, which was derived from the corresponding acetylene by hydroboration. The C5 and C18 chiral centers in these parts were created
A New Method of Deuterium Incorporation to TMS-Epoxyalcohol Using Sodium Methylsulfinylmethylide-d5 (NaDMSO-d5)
作者:Yuichi Kobayashi、Yutaro Nanba、Shuhei Tanabe
DOI:10.3987/com-18-s(t)32
日期:——
A reaction of 1-TMS-1,2-epoxyoctan-3-ol with NaDMSO-d(5) (Na+ CD3S(O)CD2-), prepared in situ from DMSO-d(6) and NaH, afforded non-1-ene-1,1-d(2)-3,4-diol. Both the anti and syn isomers showed similar reactivity and the stereochemistry was preserved. alpha-Ethoxyethyl ether of the epoxy alcohol was converted to the corresponding mono-ethoxyethyl ether of the 1-ene-3,4-diol. Hydroboration and hydrogenation of the corresponding TBS ethers afforded compounds with the "CH2CD2OH" and "CH2CD2H" groups, respectively.