Dithiane-directed Rh(<scp>iii</scp>)-catalyzed amidation of unactivated C(sp<sup>3</sup>)–H bonds
作者:Heyao Shi、Darren J. Dixon
DOI:10.1039/c8sc05225e
日期:——
An oxidant-free Rh(III)-catalyzeddirect amidation of alkyl dithianes via C(sp3)–H bond activation utilizing diverse and robust dioxazolone reagents is reported. The reaction hinges on use of a Cp*Rh(III) complex in combination with an essential amino-carboxylate additive to generate usefully protected 1,3-aminoaldehyde derivatives. The scalability of the reaction was demonstrated as was a series of
据报道,利用多种稳定的二恶唑酮试剂,通过C(sp 3 )–H 键活化,在无氧化剂 Rh( III ) 催化下,烷基二噻烷直接酰胺化。该反应取决于使用 Cp*Rh( III ) 络合物与必需的氨基羧酸盐添加剂组合来生成有效保护的 1,3-氨基醛衍生物。反应的可扩展性以及一系列下游产物功能化(包括二噻烷脱保护、阴离子烷基化和还原脱硫)得到了证明,突出了这种转化在新型支架和结构单元合成中的普遍适用性。
INTERMEDIATE OF ERIBULIN AND PREPARATION METHOD THEREFOR
申请人:SELECTION BIOSCIENCE LLC
公开号:US20200095235A1
公开(公告)日:2020-03-26
Disclosed are an intermediate of Eribulin and a preparation method therefor. In particular, disclosed are compounds as represented by formula II, formula III and formula V and a preparation method therefor. Ar is C
1-10
alkyl substituted, alkyloxy substituted or unsubstituted aryl; R
1
and R
2
is an acetal protecting group or a thioacetal protecting group; R
3
is hydrogen or a hydroxyl protecting group; and X is halogen or a leaving group. The preparation method therefor has the advantages of mild reaction conditions, high selectivity, easy purification, low synthesis cost and the like, being suitable for large scale production.
Intermediate of eribulin and preparation method therefor
申请人:SELECTION BIOSCIENCE LLC
公开号:US11186570B2
公开(公告)日:2021-11-30
Disclosed are an intermediate of Eribulin and a preparation method therefor. In particular, disclosed are compounds as represented by formula II, formula III and formula V and a preparation method therefor. Ar is C1-10 alkyl substituted, alkyloxy substituted or unsubstituted aryl; R1 and R2 is an acetal protecting group or a thioacetal protecting group; R3 is hydrogen or a hydroxyl protecting group; and X is halogen or a leaving group. The preparation method therefor has the advantages of mild reaction conditions, high selectivity, easy purification, low synthesis cost and the like, being suitable for large scale production.
公开了一种 Eribulin 中间体及其制备方法。特别是公开了由式 II、式 III 和式 V 所代表的化合物及其制备方法。式 II 中,Ar 为 C1-10 烷基取代、烷氧基取代或未取代的芳基;R1 和 R2 为缩醛保护基团或硫代缩醛保护基团;R3 为氢或羟基保护基团;X 为卤素或离去基团。其制备方法具有反应条件温和、选择性高、易于纯化、合成成本低等优点,适合大规模生产。