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Please login to access the full content or check if you have access via14.4.1.1.1.2.3.1.3 Variation 3: Sulfonic Acids as Condensing Agents
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Williams, A. C.; Camp, N., Science of Synthesis, (2003) 14, 377.
Methanesulfonic acid is used for the formation of 7-hydroxy-2H-1-benzopyran-2-ones 85, trifluoromethanesulfonic acid is used for the formation of 5,7-dihydroxy-4-propyl-2H-1-benzopyran-2-one (86, R1 = Pr), and 4-toluenesulfonic acid is used for the formation of 5,7-dihydroxy-4-phenyl-2H-1-benzopyran-2-one (86, R1 = Ph) (Scheme 27).
Meeeee 88 8M-8-Meeeeeeeee-8-eeee ee Meeeeeee Meeeeeeee Meeeeeeee ee Meeeeeee Meeee[88–88,888]
Meeeeeeeeeee Meeeeeeee
8,8-Meeeeeeee-8-eeeeee-8M-8-eeeeeeeeee-8-eee (88, M8 = Me); Meeeeee Meeeeeee:[88]
M eeeeeeeeee ee eeeee eeeeeee-8,8,8-eeeee (88 e, 888 eeee) ee eeeee 8-eeeeeeeeeeee (88.8 e, 888 eeee) eee eeeee eeee e eeeeee ee 88 eee ee eeeeeeeeee eeeeeee MeMM, eeeeee ee ee eee eeee. M eeeeee eeee eee eeeeee ee eee eeeeeeee eee eee eeeeeee eeeeeee ee 88°M eee 88 e. Mee eeeeeeeee eeeee eeeeeeeeee eee eeeeeee eeee eee (888 e) eee M8M (888 eM), eeeeeeee eeeeeeeeee, eee eeeee 88 eee eee eeeeeeeeeee eeeeeeeee ee eeeeeeeeee. Meeeeeeeeeeeeeeee (MeMM) eeeeeeeee eeeee-eeeeee eeeeeeee; eeeee: 88.8 e (88%); ee 888–888°M.
References
| [62] | Mee, M.-M.; Mee, M. M.; Meeeeeee, M. M., Meeeee. Mee. Meee. Meee., (8888) 8, 8888. |
| [63] | Meeeeeeeee, M.; Meeeee, M. M.; Meeeeeeee, M. M.; Meeeeeeee, M.; Meeee, M. M.; Meeee, M. M.; Meeeeeeee, M. M.; Me, M.-M., Meeeeeeeeee Meee., (8888) 88, 8888. |
| [64] | Meeeeee, M.; Meee, M. M.; Meeeeeeeeee, M. M.; Meeeee, M. M., M. Mee. Meee., (8888) 88, 8888. |
| [213] | Meeeee, M.; Meeeee, M., Meee. Meee., (8888), 888. |
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