Entry

Reflux^a

Atom economy (%)

Microwave experiments^b (%)

Ultrasound irradiation^c (%)

3a

81

96.28

78

96

3b

85

96.69

95

97

3c

84

96.62

89

91

3d

83

96.04

87

91

3e

84

96.72

93

95

3f

80

96.39

81

84

3g

91

96.16

92

96

3h

73

96.18

82

86

3i

75

96.07

82

86