Methyl 3-bromopropanoate → 2,2-Dimethyl-4,6-dioxo-5-[3-[(triphenylmethyl)thio]propyl]-1,3-dioxane-5-propanoic acid methylester

HRID 842598노트

반응식

HRID 842598 반응식
[CH3:1][C:2]1([CH3:33])[O:7][C:6](=[O:8])[CH:5]([CH2:9][CH2:10][CH2:11][S:12][C:13]([C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)([C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)[C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[C:4](=[O:32])[O:3]1.[CH3:34][O:35][C:36](=[O:40])[CH2:37][CH2:38]Br.C[O-].[Na+]>CO.CCCCCC.C(OC(=O)C)C>[CH3:34][O:35][C:36](=[O:40])[CH2:37][CH2:38][C:5]1([CH2:9][CH2:10][CH2:11][S:12][C:13]([C:26]2[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=2)([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[C:20]2[CH:21]=[CH:22][CH:23]=[CH:24][CH:25]=2)[C:6](=[O:8])[O:7][C:2]([CH3:33])([CH3:1])[O:3][C:4]1=[O:32]

참가 물질

6

반응물 3

HCID 76934Methyl 3-bromopropanoateHCID 10942334Sodium MethoxideHCID 111343192,2-Dimethyl-5-(3-((triphenylmethyl)thio]propyl]-1,3-dioxane-4,6-dione

생성물 1

HCID 110821512,2-Dimethyl-4,6-dioxo-5-[3-[(triphenylmethyl)thio]propyl]-1,3-dioxane-5-propanoic acid methylester수율 77%

시약·촉매·용매 2

HCID 887Methanol용매HCID 21226206Ethyl acetate hexane용매

실험 절차

5 mmol of 2,2-dimethyl-5-[3-[(triphenylmethyl)thio]-propyl]-1,3-dioxane-5-propanoic-4,6-dione (I) (2.3 g), was dissolved with 20 mmol methyl-3-bromopropionate (3.34 g=2.18 ml) and 4.6 ml of 4.37 M methanolic solution of sodium methoxide (20 mmol) in 10 ml of methanol. The reaction mixture was heated to 60° C. overnight after which TLC in hexane/ethylacetate 1:1 detected no starting material. The mixture was then evaporated to dryness and mixed with 40 ml of aqueous 10% KHSO4. The organic material was extracted by 3 portions of EtOAc, the organic layers were combined dried with MgSO4 and evaporated. The residue was crystallized from hexane/ethylacetate to yield 2.1 g (77%) of 2,2-dimethyl-4,6-dioxo-5-[3-[(triphenylmethyl)thio]propyl]-1,3-dioxane-5-propanoic acid methyl ester (II), 13C-NMR (CDCl3) δ24.6, 29.4, 29.5, 29.6, 31.4, 32.6, 37.7, 51.9, 52.8, 66.8, 105.7, 126.7, 127.9, 129.5, 144.7, 168.4, 172.0.

후처리

  1. customThe mixture was then evaporated to dryness
  2. additionmixed with 40 ml of aqueous 10% KHSO4
  3. extractionThe organic material was extracted by 3 portions of EtOAc
  4. dry with materialthe organic layers were combined dried with MgSO4
  5. customevaporated
  6. customThe residue was crystallized from hexane/ethylacetate

출처 및 근거

ORD 기록
ord-6c19afc04ca34b6a9340a47b53d03333
출처 데이터셋
uspto-grants-2002_04
특허 번호
US06376478B1

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