Prins Cyclizations: Labeling Studies and Application to Natural Product Synthesis
摘要:
[GRAPHICS]The first syntheses of two natural products, catechols 1 and 2, isolated from Plectranthus sylvestris (labiatae), are reported. Oxygen-18 labeling studies support the proposed intermediacy of a stabilized benzylic cation in the acid-promoted cyclization of an aldehyde and benzylic homoallylic alcohol possessing an electron-rich aromatic ring, In contrast, with an electron-deficient aromatic ring the pathway via a benzylic cation is only minor.
Prins Cyclizations: Labeling Studies and Application to Natural Product Synthesis
摘要:
[GRAPHICS]The first syntheses of two natural products, catechols 1 and 2, isolated from Plectranthus sylvestris (labiatae), are reported. Oxygen-18 labeling studies support the proposed intermediacy of a stabilized benzylic cation in the acid-promoted cyclization of an aldehyde and benzylic homoallylic alcohol possessing an electron-rich aromatic ring, In contrast, with an electron-deficient aromatic ring the pathway via a benzylic cation is only minor.
Prins Cyclizations: Labeling Studies and Application to Natural Product Synthesis
作者:Stuart R. Crosby、John R. Harding、Clare D. King、Gregory D. Parker、Christine L. Willis
DOI:10.1021/ol020127o
日期:2002.10.1
[GRAPHICS]The first syntheses of two natural products, catechols 1 and 2, isolated from Plectranthus sylvestris (labiatae), are reported. Oxygen-18 labeling studies support the proposed intermediacy of a stabilized benzylic cation in the acid-promoted cyclization of an aldehyde and benzylic homoallylic alcohol possessing an electron-rich aromatic ring, In contrast, with an electron-deficient aromatic ring the pathway via a benzylic cation is only minor.